Folks,
whilst I have a recess to take a Silva 80 compass on the boat I am wondering about the 58 as a cheaper alternative..has anyone installed one as a permanent fitting as an alternative to the four-bungees to the decklines? I can find no illustration online of the underneath to be able to see how the bungees attach to it., I guess holes as one online retailer does say it can be screw fitted?
many thanks

But, while it's cheaper, it's also rather smaller - and thus more difficult to read as it'll be mounted rather further for'ard than most folk would mount a 58 using bungee. Assuming you have the usual recess provided in most modern boats, by the front hatch, it's intended for what used to be known as a Silva / Garmin 70P, which now seems (as you note) to be a 100P

You just unscrew the 58 baseplate, take off the bungees, and use your deck bungees instead, before screwing on the baseplate again. It allows you to put it where you want it, rather than being proscribed a set position that may or may not be suitable due to your eyesight, sail mounting point etc etc. You can also easily take it off your oat & swap it to another without any holes being drilled.

sleepyfolk wrote:The front recessed compass is a 70p , the 100p is designed to be mounted into a vertical bulkhead surface I think

On digging a bit, it seems that both will mount vertically, or on an angled surface (as with the mounting on a kayak). Unless the op's mount is significantly different from most boats, what is needed is a 70, not the 100.

If cost is the main driver and you don't mind a bit of fiddling about, you can get an excellent compass for less than £9 online herehttps://www.amazon.co.uk/compass-SODIAL ... navigation
After some disassembly you can get out the compass hemisphere
and with a little fiddling it can look like this mounted in a Scorpio LV.
Also available in black herehttps://www.amazon.co.uk/d/Marine-Water ... NQDSXFMKKK
Same disassembly but different fiddling to retrofit to a Shrike shown here.
Both versions work well.
Happy to send / post details of the disassembly an fiddling if folks are interested.

Re budget Compass, thank you so much for pointing the way. Here's my take on it, the bungees attach to the safety lines and the compass sits on the front hatch cover (my Stratos has no dedicated recess). It's a quick cobble together for a trip tomorrow where I will test the kit. I've used brass screws to hold the stripped compass to the wood block. The shock cord runs in a groove below the compass. £9.79.

If cost is the main driver and you don't mind a bit of fiddling about, you can get an excellent compass for less than £9 online here
After some disassembly you can get out the compass hemisphere
and with a little fiddling it can look like this mounted in a Scorpio LV.
Also available in black herehttps://www.amazon.co.uk/d/Marine-Water ... NQDSXFMKKK
Same disassembly but different fiddling to retrofit to a Shrike shown here.
Both versions work well.
Happy to send / post details of the disassembly an fiddling if folks are interested.